DetectNetConnect

'Registry APIs.

Public Const HKEY_CLASSES_ROOT = &H80000000
Public Const HKEY_CURRENT_USER = &H80000001
Public Const HKEY_LOCAL_MACHINE = &H80000002
Public Const HKEY_USERS = &H80000003
Public Const HKEY_PERFORMANCE_DATA = &H80000004
Public Const HKEY_CURRENT_CONFIG = &H80000005
Public Const HKEY_DYN_DATA = &H80000006
Public Const ERROR_SUCCESS = 0&
Public Const APINULL = 0&
Public Const MAX_STRING_LENGTH As Integer = 256
Declare Function RegOpenKey Lib "advapi32.dll" Alias "RegOpenKeyA" (ByVal
hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As
Long
'RegQueryValueEx: If you declare the lpData parameter as

'String, you must pass it By Value.

Declare Function RegQueryValueEx Lib "advapi32.dll" _
Alias "RegQueryValueExA" (ByVal hKey As Long, _
ByVal lpValueName As String, ByVal lpReserved As Long, _
lpType As Long, lpData As Any, lpcbData As Long) As Long
'Remote Access Services (RAS) APIs.

Public Const RAS_MAXENTRYNAME As Integer = 256
Public Const RAS_MAXDEVICETYPE As Integer = 16
Public Const RAS_MAXDEVICENAME As Integer = 128
Public Const RAS_RASCONNSIZE As Integer = 412
Public Type RasEntryName
dwSize As Long
szEntryName(RAS_MAXENTRYNAME) As Byte
End Type
Public Type RasConn
dwSize As Long
hRasConn As Long
szEntryName(RAS_MAXENTRYNAME) As Byte
szDeviceType(RAS_MAXDEVICETYPE) As Byte
szDeviceName(RAS_MAXDEVICENAME) As Byte
End Type
Public Declare Function RasEnumConnections Lib "rasapi32.dll" _
Alias "RasEnumConnectionsA" (lpRasConn As Any, _
lpcb As Long, lpcConnections As Long) As Long
Public Declare Function RasHangUp Lib "rasapi32.dll" _
Alias "RasHangUpA" () (ByVal hRasConn As Long) As Long
Public gstrISPName As String
Public ReturnCode As Long
'Name: Detect if there is a Dial up network connection

'Description:Here is how I detect if there is a DUN

'(ISP) connection. You want to take a look at the

'Remote Access Services (RAS) APIs. They are

'fully documented at the Microsoft site."J Gerard Olszowiec"

'entity@ns.sympatico.ca By: Newsgroup Posting

Public Function Connected_To_ISP() As Boolean
Dim hKey As Long
Dim lpSubKey As String
Dim phkResult As Long
Dim lpValueName As String
Dim lpReserved As Long
Dim lpType As Long
Dim lpData As Long
Dim lpcbData As Long
Connected_To_ISP = False
lpSubKey = "System\CurrentControlSet\Services\RemoteAccess"
ReturnCode = RegOpenKey(HKEY_LOCAL_MACHINE, lpSubKey, phkResult)
If ReturnCode = ERROR_SUCCESS Then
hKey = phkResult
lpValueName = "Remote Connection"
lpReserved = APINULL
lpType = APINULL
lpData = APINULL
lpcbData = APINULL
ReturnCode = RegQueryValueEx(hKey, lpValueName, lpReserved, lpType,
ByVal lpData, lpcbData)
lpcbData = Len(lpData)
ReturnCode = RegQueryValueEx(hKey, lpValueName, lpReserved, lpType,
lpData, lpcbData)
If ReturnCode = ERROR_SUCCESS Then
If lpData = 0 Then
' ' Not Connected

Else
' ' Connected

Connected_To_ISP = True
End If
End If
RegCloseKey (hKey)
End If
End Function

'2) Once I determine that I'd like to disconnect, How do I

' do that? It seems like I need some interface to DUN to

' do it. Use RasHangUp. In this example I display a splash

' screen (frmHangupSplash) while the hangup is in progress.

' You'll want to set gstrISPName = Get_ISP_Name() before

' calling HangUp(), or better yet modify HangUP and

' pass the DUN connection name (the ISP) as a parameter..


Public Sub HangUp()
Dim i As Long
Dim lpRasConn(255) As RasConn
Dim lpcb As Long
Dim lpcConnections As Long
Dim hRasConn As Long
frmHangupSplash.Show
frmHangupSplash.Refresh
lpRasConn(0).dwSize = RAS_RASCONNSIZE
lpcb = RAS_MAXENTRYNAME * lpRasConn(0).dwSize
lpcConnections = 0
ReturnCode = RasEnumConnections(lpRasConn(0), lpcb, lpcConnections)
' ' Drop ALL the connections that match the currect

' ' connections name.

If ReturnCode = ERROR_SUCCESS Then
For i = 0 To lpcConnections - 1
If Trim(ByteToString(lpRasConn(i).szEntryName)) =
Trim(gstrISPName) Then
hRasConn = lpRasConn(i).hRasConn
ReturnCode = RasHangUp(ByVal hRasConn)
End If
Next i
End If

' It takes about 3 seconds to drop the connection.


Wait (3)

While Connected_To_ISP
Wait (1)
Wend

Unload frmHangupSplash

End Sub

Public Sub Wait(sngSeconds As Single)
Dim sngEndTime As Single
sngEndTime = Timer + sngSeconds
While Timer < sngEndTime
DoEvents
Wend
End Sub

Public Function Get_ISP_Name() As String
Dim hKey As Long
Dim lpSubKey As String
Dim phkResult As Long
Dim lpValueName As String
Dim lpReserved As Long
Dim lpType As Long
Dim lpData As String
Dim lpcbData As Long
Get_ISP_Name = ""
If gblnConnectedToISP Then
lpSubKey = "RemoteAccess"
ReturnCode = RegOpenKey(HKEY_CURRENT_USER, lpSubKey, phkResult)
If ReturnCode = ERROR_SUCCESS Then
hKey = phkResult
lpValueName = "Default"
lpReserved = APINULL
lpType = APINULL
lpData = APINULL
lpcbData = APINULL
ReturnCode = RegQueryValueEx(hKey, lpValueName, lpReserved,
lpType, ByVal lpData, lpcbData)
lpData = String(lpcbData, 0)
ReturnCode = RegQueryValueEx(hKey, lpValueName, lpReserved,
lpType, ByVal lpData, lpcbData)
If ReturnCode = ERROR_SUCCESS Then
' ' Chop off the end-of-string character.

Get_ISP_Name = Left(lpData, lpcbData - 1)
End If
RegCloseKey (hKey)
End If
End If
End Function

Public Function ByteToString(bytString() As Byte) As String
'Convert a string in byte format (usually from a DLL call)

'to a string of text.

Dim i As Integer
ByteToString = ""
i = 0

While bytString(i)0&
ByteToString = ByteToString & Chr(bytString(i))
i = i + 1
Wend

End Function